Which component is not a membrane-bound organelle?

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Prepare for the VCE Biology Unit 1 Exam with flashcards and multiple choice questions. Each question includes hints and explanations to ensure you understand the concepts thoroughly. Boost your confidence and readiness for the test.

Multiple Choice

Which component is not a membrane-bound organelle?

Explanation:
The main idea here is recognizing which cellular components are enclosed by a phospholipid membrane. The Golgi apparatus, mitochondria, and rough endoplasmic reticulum each have their own membranes, creating distinct internal spaces and enabling specialized functions within the cell. A ribosome, on the other hand, is not surrounded by a membrane. It’s a ribonucleoprotein complex that carries out protein synthesis and can be free in the cytosol or attached to the rough ER, but it itself isn’t a membrane-bound organelle. So the component that is not membrane-bound is the ribosome.

The main idea here is recognizing which cellular components are enclosed by a phospholipid membrane. The Golgi apparatus, mitochondria, and rough endoplasmic reticulum each have their own membranes, creating distinct internal spaces and enabling specialized functions within the cell. A ribosome, on the other hand, is not surrounded by a membrane. It’s a ribonucleoprotein complex that carries out protein synthesis and can be free in the cytosol or attached to the rough ER, but it itself isn’t a membrane-bound organelle. So the component that is not membrane-bound is the ribosome.

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